Scieneer Common Lisp 1.3.9 online documentation

remprop symbol indicator[Function]

Look on property list of symbol for a property with specified indicator. If found, splice this indicator and its value out of the plist, and return the tail of the original list starting with indicator. If not found, return () with no side effects. The property list is updated atomically to synchronise updates using get and remprop.

Note: The ANSI CL specification requires remprop to return true (not false) or false (the symbol nil). Portable code should not rely on any other value.